NEW YORK -- Joan Rivers was hospitalized today after she was rushed from a doctor's office when she went into cardiac arrest, police and hospital officials said.
In a statement, Melissa Rivers said her mother was "resting comfortably" with family. She did not elaborate on the 81-year-old comedian's condition.
"We ask that you continue to keep her in your thoughts and prayers," Melissa Rivers said. She offered thanks for the "overwhelming love and support for my mother."
Earlier today, The Mount Sinai Hospital spokesman Sid Dinsay confirmed that Rivers was brought there in the morning.
New York City police officials, who spoke on the condition of anonymity because they weren't authorized to publicly name Rivers, said she was taken to the hospital just after 9:30 a.m. today. It was unclear why she was visiting the doctor's office.
Rivers' representatives didn't immediately respond to requests for comment.
The entertainer has logged a half-century in show business and gave rise to red carpet commentary -- and the snarky criticism that often accompanies it. Her signature red carpet query: "Who are you wearing?"
She continues to maintain a busy schedule, and was to perform a show Friday at the Count Basie Theatre in Red Bank, New Jersey. That show was postponed because of her hospitalization.
Rivers spoke at an employee event at Time Inc. in New York on Wednesday night and appeared healthy, practically jogging when she walked in to take her seat, said Shira Blum, an online project manager.
"She seemed totally healthy," Blum said. "She was very energetic, hilarious, funny. And it was such a shock, a surprise to hear the news this morning."